5 papers
Zero modes and oscillatory instabilities of a Lorentz-violating Kalb-Ramond field on a Schwarzschild background
Hong-Da Lyu, Zhi Xiao, Zhong-Xi Yu +1
We study equilibrium configurations and linear perturbations of a Lorentz-violating Kalb--Ramond field with a quartic symmetry-breaking potential and a non-minimal Riemann coupling…
Solar-System Bounds on Ricci-flat Spindle Deformations of Schwarzschild
Zhong-Xi Yu, Hong-Da Lyu, Shoulong Li
Recently, a new class of deformed black-hole exact solutions was constructed in four-dimensional general relativity. The deformation is controlled by a parameter , which survive…
Black holes and neutron stars in massive Hellings-Nordtvedt theory
Zhe Luo, Liang Liang, Zhong-Xi Yu +3
Hellings-Nordtvedt theory is a vector-tensor theory in which a vector field is nonminimally coupled to curvature through two independent interactions and $A^μA^…
Revisiting black holes and their thermodynamics in Einstein-Kalb-Ramond gravity
Zhong-Xi Yu, Hong-Da Lyu, Mandula Huhe +1
Einstein-Kalb-Ramond (EKR) gravity is an alternative theory in which a rank-two antisymmetric tensor field, the Kalb-Ramond field, is nonminimally coupled to gravity, potentially g…
Radial oscillations of neutron stars in Starobinsky gravity and its Gauss-Bonnet extension
Ziyi Li, Zhong-Xi Yu, Zhe Luo +2
Starobinsky gravity, as one of the simplest and best-behaved higher-curvature gravity theories, has been extensively studied in the context of neutron stars over the past few decad…